Memorandum from R. L. Murray to Dr. Clifford K. Beck
Typescript
2 pp.
July, 1951
MurNBconcretesecond070051
OFFICIAL USE ONLY
TO: Dr. Clifford K. Beck
FROM: R. L. Murray
SUBJECT: Concrete Tests -- Second Series
COPIES TO: Dr. R. E. Fadum, Mr. C. R. Bramer, and Members of the Reactor
Committee
The effect of special setting agents that would allow the reduction of the
amount of water added was studied. The goal was to achieve a mix that was fluid
enough to make pouring easy for a contractor, with sufficient speed of setting
and final strength.
Test E. July 9, Poured 4:45 P.M.
- Composition (lb)
46.70 Georgia Barytes | |
4.70 Colemanite | Temperature 83°F |
9.80 Type III Cement | Humidity 54% |
4.00 Water (10% over specifications) |
3 cc Darex AEA (Dewey and Almy Chemical Co., | Cambridge, Mass.) |
All ingredients except Colemanite were thoroughly mixed. Five minutes later
the Colemanite was blended in this test cylinder, and was well set by 24 hours.
Test F. July 9, Poured 5:40 P.M.
- This batch was the same as for test E, except that the water content was
4.40 lb. (12.1% over specifications). The procedure used was also the same.
No significant difference in consistency at the end of 24 hours was evident.
Initial set in 24 hours.
Test G. July 10, Poured 11:55 A.M.
- Composition (lb)
- 46.70 Georgia Barytes
- 4.70 Colemanite
- 9.80 Type III Cement
- 4.60 Water (12.6% over specifications)
- The ingredients, excluding Colemanite, were thoroughly mixed and allowed to
set for an hour before Colemanite added. The mix was quite workable, with a
1/4" slump. Initial set in 24 hours.
Test H. July 10, Poured 11:45 A.M.
- Composition (lb)
- 46.70 Georgia Barytes
- 4.70 Colemanite
- 9.80 Type III Cement
- 4.00 Water (11% over specifications)
- 0.20 Puzzolith (Deflocculation agent, dissolved in water)
- The Colemanite was added five minutes after other ingredients were mixed.
Mix workable even with low water content. Although slower to set than the
others, it was hard in 48 hours.
[OFFICIAL USE ONLY]
[Page 2]
Test J. July 10, Poured 4:30 P.M.
- Composition (lb)
- 46.70 Georgia Barytes
- 4.70 Colemanite
- 9.80 Type III Cement
- 4.20 Water
- 0.05 Puzzolith
- The above materials wore mixed and hold for 45 minutes. Vary fluid work-
ing (0.30 lb of water were added shortly after the Colemanite was mixed in)
consistency. Initial set in 24 hours.
Test K. July 10, Poured 5:00 P.M.
- Composition (lb)
- 46.70 Georgia Barytes
- 4.70 Colemanite
- 9.80 Type III Cement
- 4.20 Water
- 5 cc Darex AEA
- The above materials were mixed and held for 45 minutes as before, 0.30 lb
of water added after Colemanite blended in. Not as workable as J. Initial set
in 24 hours.
Test L. July 12, Poured 12:50 A.M.
- Mixed double batch in large mixer twice the following (lb)
- 46.70 Georgia Barytes
- 9.80 Type III Cement
- 4.40 Water
- After mixing the above, and allowing a setting time of 40 minutes, twice
4.70 lb of Colemanite were mixed in, then lubricated with twice 0.40 lb of water.
The slump was 2 1/2". Two cylinders labeled as above were made.
Test N. July 12
- Ordinary Concrete (lb)
- 30 Gravel
- 20 Sand
- 7 Cement
- 6 Water
- Cylinder made for neutron experiments.
- Data on strengths and density will be supplied in a later note.